The diamond necklace that belonged to Dowager Maria Feodorovna. The total value of necklace is more then 470 karats. The diamonds were brought from India in the 17th century. Today's owner of the necklace is unknown.
From Her Majesty's Jewel Vault: Empress Marie Feodorovna's Sapphire Brooch-owned by the British Royal Family; it was given to Empress Maria Feodorovna (Princess Dagmar of Denmark) by her sister, Princess Alexandra and her husband Prince Edward (later Queen and King); after the revolution, Maria's jewels were sold. The brooch was bought by Queen Mary and bequeathed to Queen Elizabeth.
Tsar Paul I Petrovich Romanov (Pavel Petrovich Romanov) (1 Oct 1754-23 Mar 1801) Russia was murdered in his bedroom in St Michael's Castle, St. Petersburg, Russia by a band of dismissed officers. They tried to make him to sign his abdication but Paul I resisted & 1 of the assassins struck him with a sword before he was strangled & trampled to death. He was succeeded by his son, the 23-year-old Alexander Pavlovich Romanov (23 Dec 1777-1 Dec 1825) Russia.